Improvement in valves



W. MANN & S'. OWENS.

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lilllll" VALVE.

NJEYEB PHOTO-UTHOGRAFNER. WASHINGTON.

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ETTED STATES PATENT EEIcE.1

WILLIAM MANN AND SAMUEL OWENS, OF LONDON, ENGLAND.

IMPROVEMENT IN VALVES.

Specification forming part of Letters Patent No. 189,049, dated April 3,1877; application filed February 22, 1877. Y

To all whom it may concern:

Be it known that we, WILLIAM MANN and SAMUEL OWENS, of London, England,have invented a new and useful Improvement in Valves; and we do herebydeclare the following to be a full and correct description of the same,reference being had to the accompanying drawings, in which- Figure 1 isa vertical section of the valve. Fig. 2 is a side elevation, the shellbeing broken vaway online .fr of Fig. l. Fig. 3 is a horizontal sectionon line y y of Fig. 1, looking downward; Figs. 4 and 5, details of theindicator.

The saine letter indicates the same part wherever it occurs.

The nature of our invention consists in the peculiar construction of avalve-locking device, in which the saine screw-spindle which raises andlowers the slide carries a spiral cam or eccentric, which bears againsta rib on the back of the slide to close the same, and by the rotation ofthe spindle releases the slide, both movements being instantaneous, andunaccompanied bythe sticking and jamming which are apt to occur invalves in which the locking is done gradually by a wedging device.

In the accompanying drawings, A marks the body or case of the valve, andB `the -screw portion ofthe spindle G. The lower end of the spindleturns in a step, I, at the bottom of the valve, and to its upper end isattached a crank or hand-wheel for turning it. The screw B passesthrough a threaded nut, F, working, with slight play, in a bracket, P,fixed to the slide D. By turning the spindie the screw is made to raiseor lower the slide, to open or close the valve, as desired. On the partof' spindle G below the screw B is attached a spiral cam, O, which has abearing on a rib or projection, E, when the valve is shut, at whichmoment the projection comes into position to receive the pressure of thecam.

When the valve is to be opened, the spindle G is turned the reverse way,and, by the slight play allowed the nut F, the pressure ot' cam G uponrib E is removed, so as to rclieve the slide of all pressure before thescrew cornes into position for lifting the slide D.

Near the top of spindle G is fixed, by a key, a worin, K, which gearsinto a worm-wheel,

L, fixed on a horizontal axis. On the end of this axis is a pointer,which shows, by its position on an index-plate, the position of thevalve, indicating to what extent it is opened or closed.

Having thus fully described our invention, what we claim, and desire tosecure by Letters Patent, is-` 1. The combination ofthe spindle G, screwB, nut F, cam O, rib E, and slide D, all constructed, arranged, andoperating substantially in the manner and for the purpose described.

2. The'slide D, provided with the rib E, and driven to its seat by meansot a cam on the saine shaft as the screw,for raising and lowering theslide, all asspecied.

3. The nut F, playing in the bracket P, in combination with the screw B,cam C, and slide D, all as and for the purpose stated.

The above specitication of our said invention signed and witnessed atLondon this 3d day of November, A. D. 1876.

YVILLIAM MANN. SAMUEL OWENS.

Witnesses HENRY GoLEY, CHARLES BUTLER.

